US9958591B2 - Backlight module - Google Patents
Backlight module Download PDFInfo
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- US9958591B2 US9958591B2 US14/611,284 US201514611284A US9958591B2 US 9958591 B2 US9958591 B2 US 9958591B2 US 201514611284 A US201514611284 A US 201514611284A US 9958591 B2 US9958591 B2 US 9958591B2
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- light
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- 239000012788 optical film Substances 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 4
- 239000010408 film Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 description 32
- 238000000034 method Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000005488 sandblasting Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
Definitions
- the invention relates to a backlight module, and more particularly, to a backlight module suitable for a display apparatus.
- LCD liquid crystal displays
- backlight module Since the liquid crystal panel does not emit light on its own, the backlight module is needed to provide a desired surface light source.
- the back light module is categorized into a direct-type backlight module and a side-type backlight module.
- the side-type backlight module generally includes a light guide plate, a light source located beside a light incident surface of the light guide plate, and an optical film located on a light emitting surface of the light guide plate.
- a light beam emitted by the light source is guided into the entire light guide plate after entering the light guide plate from the light incident surface.
- a plurality of microstructures is disposed on a bottom surface and the light emitting surface of the light guide plate to destroy the total reflection of light beam such that the light beam is emitted from the light emitting surface of the light guide plate.
- the light beam emitted from the light emitting surface further passes through the optical film located above the light guide plate and forms the surface light source needed for the display panel.
- a sandblasting process is mainly used for the microstructures located on the light emitting surface of the light guide plate. Since the design parameters of the microstructures such as dimension, shape, and distribution cannot be effectively controlled in the sandblasting process, the light beam emitted from the light guide plate has the issue of low directivity. Moreover, when the light guide plate and a prism sheet are used together, since the light beam emitted from the light guide plate and the prism sheet are poorly matched in terms of angle, the prism sheet cannot effectively make the light beam from the light guide plate be emitted perpendicularly to the light emitting surface. As a result, the overall light utilization efficiency and luminance of the backlight module are reduced. Moreover, the sandblasting process readily causes the generation of bright spots. The various issues above make it difficult to improve the overall optical quality of the backlight module. Therefore, how to solve the issues above is one focus of concern for those skilled in the art.
- Taiwan Patent No. 1375822, M264503, 1296694, M264504, and 1301920 and Taiwan Patent Publication No. 201344307 respectively disclose various microstructure designs of the light guide plate for destroying the total reflection of light beam and improving light utilization efficiency.
- the invention provides a backlight module.
- the backlight module can effectively improve light utilization efficiency and luminance when a light guide plate and a prism sheet are used together.
- an embodiment of the invention provides a backlight module including a light guide plate, a reverse prism sheet, and a first light source.
- the light guide plate has a bottom surface, a light emitting surface, a first light incident surface, and a plurality of microstructures.
- the bottom surface and the light emitting surface are opposite to each other, and the first light incident surface is connected to the bottom surface and the light emitting surface.
- Each of the microstructures recesses into or protrudes from the bottom surface, and each of the microstructures has a first surface and a second surface.
- the first surface and the second surface of at least one of the microstructures are located on two sides of a first reference plane parallel to the first light incident surface, wherein the section-line of each of the first surfaces on the second reference plane perpendicular to the first light incident surface and perpendicular to the light emitting surface is a straight line.
- a first angle included between each of the first surfaces and a third reference plane parallel to the light emitting surface in the light guide plate is between 0 degrees and 20 degrees, and a thickness of each of the microstructures in a direction perpendicular to the light emitting surface is between 0 micrometers and 20 micrometers.
- the reverse prism sheet is located on the light emitting surface.
- the first light source is located adjacent to the first light incident surface.
- the first surface of each of the microstructures recessed into the bottom surface is located between the first light incident surface and the second surface, and the second surface of each of the microstructures protruded from the bottom surface is located between the first light incident surface and the first surface.
- a length of each of the microstructures in a direction perpendicular to the first light incident surface is between 0 micrometers and 500 micrometers
- a width of each of the microstructures in a direction parallel to the first light incident surface and parallel to the light emitting surface is between 0 micrometers and 500 micrometers.
- a section-line of each of the first surface and the second surface of at least one of the microstructures on the first reference plane is a curved line.
- a section-line of the second surface on the second reference plane is a straight line or a curved line.
- the second surface and the first surface of each of the microstructures are asymmetrical to each other.
- a second angle included between each of the second surfaces and the third reference plane in the light guide plate is between 0 degrees and 90 degrees.
- dimensions of the microstructures are increased from the first light incident surface toward a direction away from the first light incident surface.
- intervals between two adjacent microstructures are decreased from the first light incident surface toward a direction away from the first light incident surface.
- the light guide plate further includes a second light incident surface.
- the second light incident surface and the first light incident surface are opposite to each other and the second light incident surface is connected to the bottom surface and the light emitting surface.
- the backlight module further includes a second light source located adjacent to the second light incident surface.
- the second surface and the first surface of each of the microstructures are symmetrical to each other, and a second angle included between each of the second surfaces and the third reference plane in the light guide plate is between 0 degrees and 20 degrees.
- the first surface and the second surface of each of the microstructures respectively include a plurality of flat surfaces connected in pairs.
- a shape of the microstructures relatively adjacent to the first light incident surface and a shape of the microstructures relatively adjacent to the second light incident surface are symmetrical to each other.
- the first surface and the second surface of each of the microstructures are connected to each other.
- each of the microstructures further has a connecting surface.
- the connecting surface is connected to the first surface and the second surface, a section-line of the connecting surface on the second reference plane is a straight line or a curved line, and a section-line of the connecting surface on the first reference plane is a polyline or a curved line.
- a length of the connecting surface in a direction perpendicular to the first light incident surface is between 0 micrometers and 20 micrometers.
- the light guide plate further includes a lenticular lens structure located on the light emitting surface.
- the lenticular lens structure has a plurality of lenticular lenses parallel to one another, wherein a longitudinal direction of the lenticular lenses is perpendicular to the first light incident surface, and each of the lenticular lenses protrudes toward the reverse prism sheet.
- the backlight module further includes an optical film, wherein the reverse prism sheet is located between the light guide plate and the optical film, and the optical film is a dual brightness enhancement film (DBEF) or a diffusion sheet.
- DBEF dual brightness enhancement film
- the first surface and the second surface of each of the microstructures are respectively a curved surface.
- the first angles of the microstructures are all the same.
- a section-line of each of the first surfaces and each of the second surfaces on the first reference plane is a polyline.
- a section-line of each of the first surfaces and each of the second surfaces on the third reference plane is a curved line.
- a section-line of each of the first surfaces and each of the second surfaces on the third reference plane is a polyline.
- the backlight modules of the embodiments of the invention improve the directivity of the light beam and angularly match the microstructures and the prism sheet through the design of the first surface of the microstructures.
- the prism sheet can effectively make the light beam from the light guide plate be emitted perpendicularly to the light emitting surface, such that the overall light utilization efficiency and luminance of the backlight module can be effectively improved.
- the dimensions of each of the microstructures are designed by adjusting the thickness of each of the microstructures in a direction perpendicular to the light emitting surface. In addition to reducing the visibility of the microstructures, the overall optical quality and diversity of regional brightness modulation of the backlight module can also be improved.
- FIG. 1 is a cross-sectional schematic view of a backlight module according to the first embodiment of the invention.
- FIG. 2A is a top schematic view of a microstructure in FIG. 1 .
- FIG. 2B is a cross-sectional schematic view of a microstructure on a first reference plane in FIG. 1 .
- FIG. 3A , FIG. 4A , FIG. 5A , FIG. 6A , FIG. 7A , FIG. 8A , and FIG. 9A are respectively top schematic views of the second to eighth configurations of a microstructure according to the first embodiment of the invention.
- FIG. 3B , FIG. 4B , FIG. 5B , FIG. 6B , FIG. 7B , and FIG. 8B are respectively cross-sectional schematic views of the second to seventh configurations of a microstructure on the first reference plane according to the first embodiment of the invention.
- FIG. 3C , FIG. 4C , FIG. 5C , FIG. 6C , FIG. 7C , and FIG. 8C are respectively cross-sectional schematic views of the second to seventh configurations of a microstructure on a second reference plane according to the first embodiment of the invention.
- FIG. 9B is a cross-sectional schematic view of the eighth configuration of a first surface of a microstructure on the first reference plane according to the first embodiment of the invention.
- FIG. 10 to FIG. 13 are cross-sectional schematic views of four backlight modules according to the second to fifth embodiments of the invention.
- the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component or one or more additional components are between “A” component and “B” component.
- the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
- FIG. 1 is a cross-sectional schematic view of a backlight module on a second reference plane R2 according to the first embodiment of the invention.
- FIG. 2A is a top schematic view of a microstructure in FIG. 1 .
- FIG. 2B is a cross-sectional schematic view of a microstructure on a first reference plane R1 in FIG. 1 .
- a backlight module 100 includes a light guide plate 110 , a reverse prism sheet 120 , and a first light source 130 .
- the light guide plate 110 has a bottom surface 112 , a light emitting surface 114 , a first light incident surface 116 , and a plurality of microstructures M.
- the bottom surface 112 and the light emitting surface 114 are opposite to each other and are, for instance, parallel to each other, and the first light incident surface 116 is connected to the bottom surface 112 and the light emitting surface 114 .
- the reverse prism sheet 120 is located on the light emitting surface 114 , the first light source 130 is located adjacent to the first light incident surface 116 , and the first light source 130 is used to emit a light beam B toward the first light incident surface 116 .
- Each of the microstructures M has a first surface M 1 and a second surface M 2 , wherein the first surface M 1 and the second surface M 2 are located on two sides of the first reference plane R1 parallel to the first light incident surface 116 .
- the second surface M 2 of each of the microstructures M is located between the first light incident surface 116 and the first surface M 1 .
- the first surface M 1 is connected to the second surface M 2 . That is, the first surface M 1 and the second surface M 2 of each of the microstructures M are connected to each other.
- the invention is not limited thereto.
- section-lines X 1 and X 2 of each of the first surfaces M 1 and each of the second surfaces M 2 on the second reference plane R2 perpendicular to the first light incident surface 116 and perpendicular to the light emitting surface 114 are respectively a straight line.
- section-lines X 3 and X 4 of each of the first surfaces M 1 and each of the second surfaces M 2 on a third reference plane R3 parallel to the light emitting surface 114 are respectively a curved line.
- FIG. 1 section-lines X 1 and X 2 of each of the first surfaces M 1 and each of the second surfaces M 2 on the second reference plane R2 perpendicular to the first light incident surface 116 and perpendicular to the light emitting surface 114 are respectively a straight line.
- section-lines X 3 and X 4 of each of the first surfaces M 1 and each of the second surfaces M 2 on a third reference plane R3 parallel to the light emitting surface 114 are respectively a curved line.
- FIG. 1 section-lines X 1 and
- section-lines X 5 and X 6 (section-lines X 5 and X 6 are completely overlapped) of each of the first surfaces M 1 and each of the second surfaces M 2 on the first reference plane R1 are respectively a curved line.
- the first surface M 1 and the second surface M 2 of each of the microstructures M are respectively a curved surface.
- the section-line X 2 of the second surface M 2 on the second reference plane R2 can also be a curved line.
- the section-lines X 5 and X 6 of each of the first surfaces M 1 and each of the second surfaces M 2 on the first reference plane R1 can both be a curved line or both be a polyline.
- the section-lines X 3 and X 4 of each of the first surfaces M 1 and each of the second surfaces M 2 on the third reference plane R3 can both be a curved line or both be a polyline.
- the directivity of the light beam B can be improved such that the light beam B emitted into the light guide plate 110 from the first light incident surface 116 can be transmitted toward the light emitting surface 114 at a specific angle after being reflected by the first surface M 1 .
- the specific angle is defined by a first angle ⁇ 1 included between each of the first surfaces M 1 and the third reference plane R3 in the light guide plate 110 .
- the first angle ⁇ 1 is designed to be between 0 degrees and 20 degrees such that the microstructures M and the reverse prism sheet 120 are angularly matched.
- a vertex angle of the reverse prism sheet 120 is, for instance, 60 to 70 degrees so as to improve a forward light emitting rate of a light beam B 2 .
- an angle included between the light beam B 1 emitted from the light emitting surface 114 and a direction D1 perpendicular to the light emitting surface 114 can be 60 to 80 degrees.
- the reverse prism sheet 120 can effectively make the light beam B 1 from the light guide plate 110 be emitted perpendicularly to the light emitting surface 114 , such that the overall light utilization efficiency and luminance of the backlight module 100 can be effectively improved.
- the angle of the light beam B 1 emitted from the light emitting surface 114 is mainly controlled through the design of the microstructures M.
- the light emitting surface 114 of the light guide plate 110 can be a flat surface.
- the step of forming the microstructures on the light emitting surface can be omitted for the light emitting surface 114 of the light guide plate 110 of the embodiment.
- the microstructures M can be fabricated through a method of precision processing such as fast tool servo (FTS), exposure and development, or other suitable methods. Therefore, the surface roughness of the first surface M 1 and the second surface M 2 of the microstructures M can be reduced. As a result, the degree of diffusion of the light beam B on the first surface M 1 and the second surface M 2 can be reduced, thereby improving the overall optical efficiency of the backlight module 100 .
- FTS fast tool servo
- each of the microstructures M in the direction D1 perpendicular to the light emitting surface 114 and the size of a length L of each of the microstructures M in a direction D2 perpendicular to the first light incident surface 116 are controlled at the same time. For instance, when a thickness H of each of the microstructures M is between 0 micrometers and 20 micrometers, the length L of each of the microstructures M is between 0 micrometers and 500 micrometers. Moreover, according to different design requirements, a width W of each of the microstructures M in a direction D3 parallel to the first light incident surface 116 and parallel to the light emitting surface 114 is between 0 micrometers and 500 micrometers.
- the ratio of the length L and the width W of each of the microstructures M can be greater, less than, or equal to 1.
- the ratio is determined according to design requirements.
- the length L is, for instance, less than 100 micrometers and greater than 0 micrometers
- the width W is, for instance, less than 100 micrometers and greater than 0 micrometers
- the thickness H is, for instance, less than 10 micrometers and greater than 0 micrometers
- the first angle ⁇ 1 is, for instance, between 0 degrees and 10 degrees.
- the shape of the first surface M 1 of each of the microstructures M is, for instance, a bell shape
- the shape of the second surface M 2 of each of the microstructures M is, for instance, a bow shape.
- the invention is not limited thereto.
- the thickness H of each of the microstructures M in addition to reducing the visibility of the microstructures M, the degree of modulability of the microstructures M in distribution location and distribution density can also be improved. As a result, the overall optical quality and diversity of regional brightness modulation of the backlight module 100 can be improved.
- the method of modulating the regional brightness includes, for instance, changing the interval between two adjacent microstructures M.
- intervals P between two adjacent microstructures M can be decreased from the first light incident surface 116 in a direction away from the first light incident surface 116 (i.e., direction D2).
- the invention is not limited thereto.
- the dimensions of the microstructures M can also be increased from the first light incident surface 116 in a direction away from the first light incident surface 116 .
- the regional brightness can also be modulated by changing the first angle ⁇ 1 of the microstructures M, such as by making the first angles ⁇ 1 of the microstructures M different according to distribution location.
- the reverse prism sheet 120 has a plurality of triangular lenticular prisms 122 parallel to one another, wherein a longitudinal direction of the triangular lenticular prisms 122 is perpendicular to the second reference plane R2 (i.e., parallel to the direction D3) and each of the triangular lenticular prisms 122 protrudes toward the light emitting surface 114 . That is, the vertex of the reverse prism sheet 120 protrudes toward the light emitting surface 114 .
- the section-line of each of the triangular lenticular lenses 122 on the first reference plane R1 is a straight line and the section-line of each of the triangular lenticular lenses 122 on the second reference plane R2 is a polyline.
- the first light source 130 for instance, includes a plurality of light-emitting diodes (only 1 is shown in FIG. 1 ), and the light-emitting diodes are arranged along the direction D3.
- the first light source 130 can also be a cold cathode fluorescent lamp (CCFL) (not shown in FIG. 1 ), and the extending direction of the CCFL is parallel to the direction D3.
- CCFL cold cathode fluorescent lamp
- the backlight module 100 of the embodiment can selectively include at least one of a bottom reflective sheet 140 , a lenticular lens structure 150 , and an optical film 160 (all of the bottom reflective sheet 140 , the lenticular lens structure 150 , and the optical film 160 are shown in FIG. 1 , but the invention is not limited thereto).
- the bottom reflective sheet 140 is located below the bottom surface 112 for reflecting the light beam passing out of the light guide plate 110 from the bottom surface 112 back into the light guide plate 110 . As a result, light utilization efficiency is improved.
- the lenticular lens structure 150 located on the light emitting surface 114 of the light guide plate 110 has a plurality of lenticular lenses 152 parallel to one another (only one lenticular lens 152 is shown in FIG. 1 due to cross-sectional direction), wherein a longitudinal direction of the lenticular lenses 152 is perpendicular to the first light incident surface 116 .
- the lenticular lenses 152 are arranged along the direction D3 and are respectively extended toward the direction D2.
- each of the lenticular lenses 152 protrudes toward the reverse prism sheet 120 .
- the section-line of each of the lenticular lenses 152 on the first reference plane R1 is a curved line and the section-line of each of the lenticular lenses 152 on the second reference plane R2 is a straight line.
- the invention is not limited thereto.
- the section-line of each of the lenticular lenses 152 on the first reference plane R1 can be a polyline and the section-line of each of the lenticular lenses 152 on the second reference plane R2 is a straight line.
- the lenticular lens structure 150 is used to reduce the visibility of each of the microstructures M. When the dimensions of the microstructures M are small and the visibility is low, such as when the length L and the width W of each of the microstructures M are respectively less than 80 micrometers, the disposition of the lenticular lens structure 150 can be omitted.
- the optical film 160 is located on the reverse prism sheet 120 and the reverse prism sheet 120 is located between the optical film 160 and the light guide plate 110 .
- the optical film 160 can be a double brightness enhanced film (DBEF) such as VikuitiTM Dual Brightness Enhancement Film-Embossed (DBEF-E) or VikuitiTM Dual Brightness Enhancement Film II (DBEF-II) of 3M Company.
- DBEF double brightness enhanced film
- the optical film 160 can also be a diffusion sheet.
- FIG. 1 is exemplified by a diffusion sheet capable of diffusing the light beam B 1 from the reverse prism sheet 120 .
- the light beam B 2 emitted from the diffusion sheet has the effect of diffusion.
- the diffusion sheet is used to improve the uniformity of an exit light of the backlight module 100 .
- the current backlight module at least needs two diffusion sheets and two prism sheets to obtain the needed luminance and uniformity.
- the backlight module 100 of the embodiment can be provided with only one diffusion sheet and one reverse prism sheet.
- the dispositions of at least one diffusion sheet and one prism sheet can be omitted for the backlight module 100 of the embodiment such that the backlight module 100 has a relatively thin overall thickness.
- FIG. 1 , FIG. 2A , and FIG. 2B only schematically show one of the configurations of the microstructures, but the invention is not limited thereto.
- FIG. 3A , FIG. 4A , FIG. 5A , FIG. 6A , FIG. 7A , FIG. 8A , and FIG. 9A are respectively top schematic views of the second to eighth configurations of a microstructure according to the first embodiment of the invention.
- FIG. 3B , FIG. 4B , FIG. 5B , FIG. 6B , FIG. 7B , and FIG. 8B are respectively cross-sectional schematic views of the second to seventh configurations of a microstructure on the first reference plane R1 according to the first embodiment of the invention.
- FIG. 4C , FIG. 5C , FIG. 6C , FIG. 7C , and FIG. 8C are respectively cross-sectional schematic views of the second to seventh configurations of a microstructure on the second reference plane R2 according to the first embodiment of the invention.
- FIG. 9B is a cross-sectional schematic view of the eighth configuration of a first surface of a microstructure on the first reference plane R1 according to the first embodiment of the invention.
- the dimension design of microstructures Ma of the embodiment is substantially the same as the dimension design of the microstructures M of FIG. 2A . Moreover, the same contents are as shown in FIG. 2A and described in the corresponding descriptions and are not repeated herein.
- the main difference between the microstructures Ma and the microstructures M is that, the microstructures Ma further include a connecting surface M 3 , wherein the connecting surface M 3 is connected to the first surface M 1 and the second surface M 2 .
- section-lines X 7 and X 8 of the connecting surface M 3 on the first reference plane R1 and the second reference plane R2 are respectively a curved line.
- the invention is not limited thereto.
- the section-line X 7 of the connecting surface M 3 on the first reference plane R1 is a polyline or a curved line and the section-line X 8 of the connecting surface M 3 on the second reference plane R2 is a straight line or a curved line.
- the length of the connecting surface M 3 in the direction D2 perpendicular to the first light incident surface 116 is, for instance, between 0 micrometers and 20 micrometers.
- the invention is not limited thereto.
- microstructures Mb of the embodiment are substantially the same as the microstructures Ma of FIG. 3A , and the dimension design thereof is as shown for the dimension design of the microstructures M of FIG. 2A and is not repeated herein.
- the main difference between the microstructures Mb and the microstructures Ma is that, the section-line X 8 of the connecting surface M 3 of the microstructures Mb on the second reference plane R2 is a straight line.
- the dimension design of microstructures Mc of the embodiment is substantially the same as the dimension design of the microstructures M of FIG. 2A . Moreover, the same contents are as shown in FIG. 2A and described in the corresponding descriptions and are not repeated herein.
- the main difference between the microstructures Mc and the microstructures M is that, the section-lines X 3 and X 4 of the first surface M 1 and the second surface M 2 of the microstructures Mc on the third reference plane R3 are polylines, and the section-lines X 5 and X 6 of the first surface M 1 and the second surface M 2 of the microstructures Mc on the first reference plane R1 are polylines.
- the shape of the first surface M 1 of the microstructures Mc is, for instance, a trapezoidal shape
- the shape of the second surface M 2 is, for instance, a trapezoidal shape
- the microstructures Mc can also have the connecting surface M 3 , and the connecting surface M 3 is connected to the first surface M 1 and the second surface M 2 .
- the second surface M 2 and the first surface M 1 of each of the microstructures M, Ma, Mb, and Mc can be asymmetrical to each other.
- a second angle ⁇ 2 (as shown in FIG. 1 ) included between each of the second surfaces M 2 and the third reference plane R3 in the light guide plate 110 can be between 0 degrees and 90 degrees.
- the configuration of the microstructures of the invention is not limited thereto. Referring to FIG. 5A to FIG. 5C , FIG. 6A to FIG. 6C , and FIG. 7A to FIG.
- microstructures Me, Mf, and Mg are substantially the same as the microstructures M, Ma, and Mb. Moreover, the dimension designs of the microstructures Me, Mf, and Mg are as shown in FIG. 2A and described in the corresponding descriptions and are not repeated herein.
- the main difference between the microstructures Me, Mf, and Mg and the microstructures M, Ma, and Mb is that, the second surface M 2 and the first surface M 1 of the microstructures Me, Mf, and Mg are symmetrical to each other.
- the second angle ⁇ 2 (as shown in FIG. 1 ) included between each of the second surfaces M 2 and the third reference plane R3 in the light guide plate 110 is between 0 degrees and 20 degrees.
- each of the first surface M 1 and the second surface M 2 of each of the microstructures Me, Mf, and Mg is, for instance, a bell shape.
- the main difference between the microstructures Mg and the microstructures Mf is that, the section-line X 8 of the connecting surface M 3 of the microstructures Mg on the second reference plane R2 is a straight line, and the section-line X 8 of the connecting surface M 3 of the microstructures Mf on the second reference plane R2 is a curved line.
- microstructures Mh are substantially the same as the microstructures Me, and the dimension design thereof is as shown in FIG. 2A and described in the corresponding descriptions and is not repeated herein.
- the main difference between the microstructures Mh and the microstructures Me is that, the first surface M 1 and the second surface M 2 of the microstructures Mh respectively include a plurality of flat surfaces connected in pairs.
- the embodiment is exemplified by three groups of flat surfaces connected in pairs (flat surface M 1 a and flat surface M 2 a are connected, flat surface M 1 b and flat surface M 2 b are connected, and flat surface M 1 c and flat surface M 2 c are connected).
- the section-lines X 3 and X 4 of the first surface M 1 and the second surface M 2 on the third reference plane R3 are polylines
- the section-lines X 5 and X 6 of the first surface M 1 and the second surface M 2 on the first reference plane R1 are polylines.
- the shape of each of the first surface M 1 and the second surface M 2 of each of the microstructures Mh is, for instance, a trapezoidal shape.
- FIG. 10 to FIG. 13 are cross-sectional schematic views of four backlight modules according to the second to fifth embodiments of the invention.
- a backlight module 100 a is substantially the same as the backlight module 100 of FIG. 1 .
- the same elements are represented by the same reference numerals, and the relative disposition relationships, effects, and efficacies of the elements are not repeated herein.
- each of the microstructures MM of the embodiment recesses into the bottom surface 112 , and the first surface M 1 of each of the microstructures MM is located between the first light incident surface 116 and the second surface M 2 .
- the first surface M 1 can guide most of the light beam B from the first light incident surface 116 to the light emitting surface 114 at a specific angle.
- the dimension designs of the microstructures M, Ma, Mb, Mc, Me, Mf, Mg, and Mh can be applied to each of the microstructures MM.
- the protruding design is changed to recessing design, and the relative locations of the first surface M 1 and the second surface M 2 are switched. Since the backlight module 100 a of FIG. 10 receives light beam from one side, the dimension designs of M, Ma, Mb, and Mc are preferred for the backlight module 100 a . However, the protruding design is changed to recessing design, and the relative locations of the first surface M 1 and the second surface M 2 are switched to increase the area ratio occupied by the first surface M 1 in each of the microstructures MM. As a result, the backlight module 100 a has better light utilization efficiency.
- a backlight module 100 d is substantially the same as the backlight module 100 of FIG. 1 and the backlight module 100 a of FIG. 10 .
- the same elements are represented by the same reference numerals, and the relative disposition relationships, effects, and efficacies of the elements are not repeated herein.
- the bottom surface 112 of the light guide plate 110 can have the microstructures M protrude from the bottom surface 112 and the microstructures MM recess into the bottom surface 112 at the same time.
- the bottom surface 112 of the light guide plate 110 can also have at least two of various microstructure designs (such as the microstructures M, Ma, Mb, Mc, Me, Mf, Mg, and Mh) at the same time or a combination of a plurality of designs, and the invention is not limited thereto.
- various microstructure designs such as the microstructures M, Ma, Mb, Mc, Me, Mf, Mg, and Mh
- a backlight module 100 b is substantially the same as the backlight module 100 of FIG. 1 .
- the same elements are represented by the same reference numerals, and the relative disposition relationships, effects, and efficacies of the elements are not repeated herein.
- the backlight module 100 b further includes a second light source 170 .
- the light guide plate 110 further includes a second light incident surface 118 , wherein the second light incident surface 118 and the first light incident surface 116 are opposite to each other and the second light incident surface 118 is connected to the bottom surface 112 and the light emitting surface 114 .
- the second light source 170 is located adjacent to the second light incident surface 118 .
- the backlight module 100 b has the design architecture in which light beam is received from two sides.
- the microstructures Me, Mf, Mg, and Mh for which the second surface M 2 and the first surface M 1 are symmetrical to each other are applied to microstructures MMM such that the microstructures MMM have better optical efficiency.
- the section-line of each of the first surface M 1 and the second surface M 2 on the second reference plane R2 is a straight line, and the first angle ⁇ 1 and the second angle ⁇ 2 are respectively between 0 degrees and 20 degrees, the first surface M 1 and the second surface M 2 can reflect the light beam B entering the light guide plate 110 to the light emitting surface 114 at a specific angle.
- the light beam B 1 emitted from the light emitting surface 114 and the direction D1 perpendicular to the light emitting surface 114 form an angle of 60 to 80 degrees.
- the reverse prism sheet 120 can effectively make the light beam B 1 from the light guide plate 110 be emitted perpendicularly to the light emitting surface 114 , such that the overall light utilization efficiency and luminance of the backlight module 100 b can be effectively improved.
- the microstructures MMM are shown to be protruding from the bottom surface 112
- the microstructures MMM can also be recessing into the bottom surface 112 as shown in FIG. 10 .
- the light guide plate 110 has the microstructures MMM protrude from the bottom surface 112 and the microstructures MMM recess into the bottom surface 112 therein at the same time.
- a backlight module 100 c is substantially the same as the backlight module 100 b of FIG. 11 .
- the same elements are represented by the same reference numerals, and the relative disposition relationships, effects, and efficacies of the elements are not repeated herein.
- the difference between the backlight module 100 c and the backlight module 100 b is that, the microstructures M, Ma, Mb, and Mc for which the second surface M 2 and the first surface M 1 are asymmetrical to each other are applied to microstructures MMMM of the backlight module 100 c .
- the shape of the microstructures MMMM relatively adjacent to the first light incident surface 116 and the shape of the microstructures MMMM relatively adjacent to the second light incident surface 118 are symmetrical to each other. Specifically, under the architecture in which the microstructures MMMM protrude from the bottom surface 112 , the second surface M 2 of the microstructures MMMM relatively adjacent to the first light incident surface 116 is located between the first surface M 1 and the first light incident surface 116 , and the second surface M 2 of the microstructures MMMM relatively adjacent to the second light incident surface 118 is located between the first surface M 1 and the second light incident surface 118 .
- the invention is not limited thereto.
- the microstructures MMMM can also be recessing into the bottom surface 112 , the first surface M 1 of the microstructures MMMM relatively adjacent to the first light incident surface 116 is located between the second surface M 2 and the first light incident surface 116 , and the first surface M 1 of the microstructures MMMM relatively adjacent to the second light incident surface 118 is located between the second surface M 2 and the second light incident surface 118 .
- the design in which the microstructures MMMM protrude from the bottom surface 112 and the design in which the microstructures MMMM recess into the bottom surface 112 can also be combined on the same light guide plate.
- the embodiments of the invention can achieve at least one of the following advantages or efficacies.
- the backlight modules of the embodiments of the invention improve the directivity of the light beam and angularly match the microstructures and the prism sheet through the design of the first surface of the microstructures.
- the prism sheet can effectively make the light beam from the light guide plate be emitted perpendicularly to the light emitting surface, such that the overall light utilization efficiency and luminance of the backlight module can be effectively improved.
- the dimensions of each of the microstructures are designed by adjusting the thickness of each of the microstructures in a direction perpendicular to the light emitting surface. In addition to reducing the visibility of the microstructures, the overall optical quality and diversity of regional brightness modulation of the backlight module can also be improved.
- the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred.
- the invention is limited only by the spirit and scope of the appended claims. Moreover, these claims may refer to use “first”, “second”, etc. following with noun or element. Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given.
- the abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure.
Abstract
Description
Claims (21)
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CN201410049862.3 | 2014-02-13 | ||
CN201410049862 | 2014-02-13 | ||
CN201410049862.3A CN104848052A (en) | 2014-02-13 | 2014-02-13 | Backlight module |
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US20150226901A1 US20150226901A1 (en) | 2015-08-13 |
US9958591B2 true US9958591B2 (en) | 2018-05-01 |
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US14/611,284 Active 2036-08-12 US9958591B2 (en) | 2014-02-13 | 2015-02-02 | Backlight module |
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CN208239762U (en) | 2018-03-02 | 2018-12-14 | 扬升照明股份有限公司 | Light source module and double screen display apparatus |
KR102570053B1 (en) | 2018-05-14 | 2023-08-23 | 라디안트 (광저우) 옵토-엘렉트로닉스 컴퍼니 리미티드 | Light guide plate, backlight module and display device |
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CN109686244A (en) * | 2019-02-02 | 2019-04-26 | 京东方科技集团股份有限公司 | Backlight module and display panel |
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US20150226901A1 (en) | 2015-08-13 |
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